peatt



(No Model.)

Patented Aug. 23, 188'7.V4

TTORNEY.

limiten Frames Tirreni @einen I NAT. W. PRATT, OF BROOKLYN, NEW YORK.

MANIFOLD FOR WATER-TUBE BOILERS.

SPECIFICATION forming part of Letters Patent No. 368,615, dated August 23, 1887,

Application tiled March 3, 1887. Serial No. 229,578. (No model.)-

To all whom it may concern:

Be it known that I, NAT. WV. PRATT, a citizen of the United States, residing at Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Manifolds for Vater-Tube Boilers, of which the following is a specification.

This invention relates to the construction of manifold tube-headers for use in connecting together the series of water-tubes of sectional steam-boilers; and the said invention consists in certain novel features of said construction as applied either to corrugated or other shaped headers, whereby the same are manufactured from wrought-metal plates.

In order 'to enable others skilled in the art to which my invention appertains to understand and use the same, I will proceed to describe in detail the manner of its construction, having reference to the accompanying drawings, in which like letters of reference indicate corresponding parts.

Figures l and 2 are end and frontelevations, respectively, of a completed manifold 5 Figs. 3 and 4, similar views of the strap or periphery of the same; Figs. 5 and 6, 7 and 8, corresponding views, respectively, of the tube-sheet and the hand-hole sheet; Fig. 9, an enlarged crosssection of Fig. 2 on the line .fr x, and Fig. l0 a similarly enlarged crosssection on theline y y.

The strap or periphery A is composed of a single piece formed by bending a band or skelp into the required shape and joining the ends thereof, preferably by welding, so as to form the continuous irregular side of the box or manifold. y

The plates B and D are formed by cutting them from a plate of metal and turning a flange around their peripheries. By preference this operation would be performed by properlyformed dies in a hydraulic press in a manner well known in the art. The holes in these plates may be punched either before or after hanging, or at the same operation; but, by preference, I produce them 'by punching after the plate is iianged, whereby they are not liable to distortion by the flanging process.

To the interior margins of the strap A the plates B and D, having the required form to fit said strap, and provided, respectively, with perforations b and d, are xed in the position more clearly shown by Figs. 9 and. l0, and welded or riveted by means of their outwardly-projecting flanges b d to the said margins.

At suitable points between the perforations b and d small perforations e are provided for the reception of hollow stays or stay-bolts f, Figs. 9 and 10, which serve as a means for stiffening and further securing the plates B and D in position.

The circular perforations cl in the plates D are for the reception of water-tubes to be fixed in series therein by expanding the same, or by other well-known process.

The hand-hole perforations b of the plates B are in the present instance of circular form and outwardly flanged, so as to form an exterior seat for the hand-hole plates, the latter being held in place on the outside by means of interior yokes.

The perforaticns c in the end faces ofthe strap A are provided for the reception of tube-connections at the ends of the manifold.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. The method of making wrought-metal manifolds for water-tube boilers, consisting in first forming side plates with flanges around their periphery; second, bending a strap into form corresponding to said periphery, and, third, riveting or welding the flanges of said plate to the edges of said strap, substantially as described.

2. The method of making wrought-metal manifolds for water-tube boilers, consisting in first forming side plates with iianges around their periphery, and either at the same or at a subsequent operation perforating the said plates; second,bending a strap into form corresponding with said periphery, and, third, riveting or welding the flanges of said plates to the edges of said strap, substantially as described.

3. A wrought-metal manifold for water-tube boilers,having two ofits sides formed of flanged and perforated plates, the same being riveted or welded to a plate or plates forming the remaining sides, substantially as described.

NAT. W. PRATT.

Vitnesses:

Guns. W. Fonens, AUG. CnEvELrNe. 

